;(function (factory) {
  if (typeof exports === 'object') {
    module.exports = factory()
  } else if (typeof define === 'function' && define.amd) {
    define(factory)
  } else {
    var glob
    try {
      glob = window
    } catch (e) {
      glob = self
    }
    glob.SparkMD5 = factory()
  }
})(function (undefined) {
  'use strict'
  var add32 = function (a, b) {
      return (a + b) & 4294967295
    },
    hex_chr = [
      '0',
      '1',
      '2',
      '3',
      '4',
      '5',
      '6',
      '7',
      '8',
      '9',
      'a',
      'b',
      'c',
      'd',
      'e',
      'f'
    ]
  function cmn(q, a, b, x, s, t) {
    a = add32(add32(a, q), add32(x, t))
    return add32((a << s) | (a >>> (32 - s)), b)
  }
  function md5cycle(x, k) {
    var a = x[0],
      b = x[1],
      c = x[2],
      d = x[3]
    a += (((b & c) | (~b & d)) + k[0] - 680876936) | 0
    a = (((a << 7) | (a >>> 25)) + b) | 0
    d += (((a & b) | (~a & c)) + k[1] - 389564586) | 0
    d = (((d << 12) | (d >>> 20)) + a) | 0
    c += (((d & a) | (~d & b)) + k[2] + 606105819) | 0
    c = (((c << 17) | (c >>> 15)) + d) | 0
    b += (((c & d) | (~c & a)) + k[3] - 1044525330) | 0
    b = (((b << 22) | (b >>> 10)) + c) | 0
    a += (((b & c) | (~b & d)) + k[4] - 176418897) | 0
    a = (((a << 7) | (a >>> 25)) + b) | 0
    d += (((a & b) | (~a & c)) + k[5] + 1200080426) | 0
    d = (((d << 12) | (d >>> 20)) + a) | 0
    c += (((d & a) | (~d & b)) + k[6] - 1473231341) | 0
    c = (((c << 17) | (c >>> 15)) + d) | 0
    b += (((c & d) | (~c & a)) + k[7] - 45705983) | 0
    b = (((b << 22) | (b >>> 10)) + c) | 0
    a += (((b & c) | (~b & d)) + k[8] + 1770035416) | 0
    a = (((a << 7) | (a >>> 25)) + b) | 0
    d += (((a & b) | (~a & c)) + k[9] - 1958414417) | 0
    d = (((d << 12) | (d >>> 20)) + a) | 0
    c += (((d & a) | (~d & b)) + k[10] - 42063) | 0
    c = (((c << 17) | (c >>> 15)) + d) | 0
    b += (((c & d) | (~c & a)) + k[11] - 1990404162) | 0
    b = (((b << 22) | (b >>> 10)) + c) | 0
    a += (((b & c) | (~b & d)) + k[12] + 1804603682) | 0
    a = (((a << 7) | (a >>> 25)) + b) | 0
    d += (((a & b) | (~a & c)) + k[13] - 40341101) | 0
    d = (((d << 12) | (d >>> 20)) + a) | 0
    c += (((d & a) | (~d & b)) + k[14] - 1502002290) | 0
    c = (((c << 17) | (c >>> 15)) + d) | 0
    b += (((c & d) | (~c & a)) + k[15] + 1236535329) | 0
    b = (((b << 22) | (b >>> 10)) + c) | 0
    a += (((b & d) | (c & ~d)) + k[1] - 165796510) | 0
    a = (((a << 5) | (a >>> 27)) + b) | 0
    d += (((a & c) | (b & ~c)) + k[6] - 1069501632) | 0
    d = (((d << 9) | (d >>> 23)) + a) | 0
    c += (((d & b) | (a & ~b)) + k[11] + 643717713) | 0
    c = (((c << 14) | (c >>> 18)) + d) | 0
    b += (((c & a) | (d & ~a)) + k[0] - 373897302) | 0
    b = (((b << 20) | (b >>> 12)) + c) | 0
    a += (((b & d) | (c & ~d)) + k[5] - 701558691) | 0
    a = (((a << 5) | (a >>> 27)) + b) | 0
    d += (((a & c) | (b & ~c)) + k[10] + 38016083) | 0
    d = (((d << 9) | (d >>> 23)) + a) | 0
    c += (((d & b) | (a & ~b)) + k[15] - 660478335) | 0
    c = (((c << 14) | (c >>> 18)) + d) | 0
    b += (((c & a) | (d & ~a)) + k[4] - 405537848) | 0
    b = (((b << 20) | (b >>> 12)) + c) | 0
    a += (((b & d) | (c & ~d)) + k[9] + 568446438) | 0
    a = (((a << 5) | (a >>> 27)) + b) | 0
    d += (((a & c) | (b & ~c)) + k[14] - 1019803690) | 0
    d = (((d << 9) | (d >>> 23)) + a) | 0
    c += (((d & b) | (a & ~b)) + k[3] - 187363961) | 0
    c = (((c << 14) | (c >>> 18)) + d) | 0
    b += (((c & a) | (d & ~a)) + k[8] + 1163531501) | 0
    b = (((b << 20) | (b >>> 12)) + c) | 0
    a += (((b & d) | (c & ~d)) + k[13] - 1444681467) | 0
    a = (((a << 5) | (a >>> 27)) + b) | 0
    d += (((a & c) | (b & ~c)) + k[2] - 51403784) | 0
    d = (((d << 9) | (d >>> 23)) + a) | 0
    c += (((d & b) | (a & ~b)) + k[7] + 1735328473) | 0
    c = (((c << 14) | (c >>> 18)) + d) | 0
    b += (((c & a) | (d & ~a)) + k[12] - 1926607734) | 0
    b = (((b << 20) | (b >>> 12)) + c) | 0
    a += ((b ^ c ^ d) + k[5] - 378558) | 0
    a = (((a << 4) | (a >>> 28)) + b) | 0
    d += ((a ^ b ^ c) + k[8] - 2022574463) | 0
    d = (((d << 11) | (d >>> 21)) + a) | 0
    c += ((d ^ a ^ b) + k[11] + 1839030562) | 0
    c = (((c << 16) | (c >>> 16)) + d) | 0
    b += ((c ^ d ^ a) + k[14] - 35309556) | 0
    b = (((b << 23) | (b >>> 9)) + c) | 0
    a += ((b ^ c ^ d) + k[1] - 1530992060) | 0
    a = (((a << 4) | (a >>> 28)) + b) | 0
    d += ((a ^ b ^ c) + k[4] + 1272893353) | 0
    d = (((d << 11) | (d >>> 21)) + a) | 0
    c += ((d ^ a ^ b) + k[7] - 155497632) | 0
    c = (((c << 16) | (c >>> 16)) + d) | 0
    b += ((c ^ d ^ a) + k[10] - 1094730640) | 0
    b = (((b << 23) | (b >>> 9)) + c) | 0
    a += ((b ^ c ^ d) + k[13] + 681279174) | 0
    a = (((a << 4) | (a >>> 28)) + b) | 0
    d += ((a ^ b ^ c) + k[0] - 358537222) | 0
    d = (((d << 11) | (d >>> 21)) + a) | 0
    c += ((d ^ a ^ b) + k[3] - 722521979) | 0
    c = (((c << 16) | (c >>> 16)) + d) | 0
    b += ((c ^ d ^ a) + k[6] + 76029189) | 0
    b = (((b << 23) | (b >>> 9)) + c) | 0
    a += ((b ^ c ^ d) + k[9] - 640364487) | 0
    a = (((a << 4) | (a >>> 28)) + b) | 0
    d += ((a ^ b ^ c) + k[12] - 421815835) | 0
    d = (((d << 11) | (d >>> 21)) + a) | 0
    c += ((d ^ a ^ b) + k[15] + 530742520) | 0
    c = (((c << 16) | (c >>> 16)) + d) | 0
    b += ((c ^ d ^ a) + k[2] - 995338651) | 0
    b = (((b << 23) | (b >>> 9)) + c) | 0
    a += ((c ^ (b | ~d)) + k[0] - 198630844) | 0
    a = (((a << 6) | (a >>> 26)) + b) | 0
    d += ((b ^ (a | ~c)) + k[7] + 1126891415) | 0
    d = (((d << 10) | (d >>> 22)) + a) | 0
    c += ((a ^ (d | ~b)) + k[14] - 1416354905) | 0
    c = (((c << 15) | (c >>> 17)) + d) | 0
    b += ((d ^ (c | ~a)) + k[5] - 57434055) | 0
    b = (((b << 21) | (b >>> 11)) + c) | 0
    a += ((c ^ (b | ~d)) + k[12] + 1700485571) | 0
    a = (((a << 6) | (a >>> 26)) + b) | 0
    d += ((b ^ (a | ~c)) + k[3] - 1894986606) | 0
    d = (((d << 10) | (d >>> 22)) + a) | 0
    c += ((a ^ (d | ~b)) + k[10] - 1051523) | 0
    c = (((c << 15) | (c >>> 17)) + d) | 0
    b += ((d ^ (c | ~a)) + k[1] - 2054922799) | 0
    b = (((b << 21) | (b >>> 11)) + c) | 0
    a += ((c ^ (b | ~d)) + k[8] + 1873313359) | 0
    a = (((a << 6) | (a >>> 26)) + b) | 0
    d += ((b ^ (a | ~c)) + k[15] - 30611744) | 0
    d = (((d << 10) | (d >>> 22)) + a) | 0
    c += ((a ^ (d | ~b)) + k[6] - 1560198380) | 0
    c = (((c << 15) | (c >>> 17)) + d) | 0
    b += ((d ^ (c | ~a)) + k[13] + 1309151649) | 0
    b = (((b << 21) | (b >>> 11)) + c) | 0
    a += ((c ^ (b | ~d)) + k[4] - 145523070) | 0
    a = (((a << 6) | (a >>> 26)) + b) | 0
    d += ((b ^ (a | ~c)) + k[11] - 1120210379) | 0
    d = (((d << 10) | (d >>> 22)) + a) | 0
    c += ((a ^ (d | ~b)) + k[2] + 718787259) | 0
    c = (((c << 15) | (c >>> 17)) + d) | 0
    b += ((d ^ (c | ~a)) + k[9] - 343485551) | 0
    b = (((b << 21) | (b >>> 11)) + c) | 0
    x[0] = (a + x[0]) | 0
    x[1] = (b + x[1]) | 0
    x[2] = (c + x[2]) | 0
    x[3] = (d + x[3]) | 0
  }
  function md5blk(s) {
    var md5blks = [],
      i
    for (i = 0; i < 64; i += 4) {
      md5blks[i >> 2] =
        s.charCodeAt(i) +
        (s.charCodeAt(i + 1) << 8) +
        (s.charCodeAt(i + 2) << 16) +
        (s.charCodeAt(i + 3) << 24)
    }
    return md5blks
  }
  function md5blk_array(a) {
    var md5blks = [],
      i
    for (i = 0; i < 64; i += 4) {
      md5blks[i >> 2] =
        a[i] + (a[i + 1] << 8) + (a[i + 2] << 16) + (a[i + 3] << 24)
    }
    return md5blks
  }
  function md51(s) {
    var n = s.length,
      state = [1732584193, -271733879, -1732584194, 271733878],
      i,
      length,
      tail,
      tmp,
      lo,
      hi
    for (i = 64; i <= n; i += 64) {
      md5cycle(state, md5blk(s.substring(i - 64, i)))
    }
    s = s.substring(i - 64)
    length = s.length
    tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    for (i = 0; i < length; i += 1) {
      tail[i >> 2] |= s.charCodeAt(i) << (i % 4 << 3)
    }
    tail[i >> 2] |= 128 << (i % 4 << 3)
    if (i > 55) {
      md5cycle(state, tail)
      for (i = 0; i < 16; i += 1) {
        tail[i] = 0
      }
    }
    tmp = n * 8
    tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/)
    lo = parseInt(tmp[2], 16)
    hi = parseInt(tmp[1], 16) || 0
    tail[14] = lo
    tail[15] = hi
    md5cycle(state, tail)
    return state
  }
  function md51_array(a) {
    var n = a.length,
      state = [1732584193, -271733879, -1732584194, 271733878],
      i,
      length,
      tail,
      tmp,
      lo,
      hi
    for (i = 64; i <= n; i += 64) {
      md5cycle(state, md5blk_array(a.subarray(i - 64, i)))
    }
    a = i - 64 < n ? a.subarray(i - 64) : new Uint8Array(0)
    length = a.length
    tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    for (i = 0; i < length; i += 1) {
      tail[i >> 2] |= a[i] << (i % 4 << 3)
    }
    tail[i >> 2] |= 128 << (i % 4 << 3)
    if (i > 55) {
      md5cycle(state, tail)
      for (i = 0; i < 16; i += 1) {
        tail[i] = 0
      }
    }
    tmp = n * 8
    tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/)
    lo = parseInt(tmp[2], 16)
    hi = parseInt(tmp[1], 16) || 0
    tail[14] = lo
    tail[15] = hi
    md5cycle(state, tail)
    return state
  }
  function rhex(n) {
    var s = '',
      j
    for (j = 0; j < 4; j += 1) {
      s += hex_chr[(n >> (j * 8 + 4)) & 15] + hex_chr[(n >> (j * 8)) & 15]
    }
    return s
  }
  function hex(x) {
    var i
    for (i = 0; i < x.length; i += 1) {
      x[i] = rhex(x[i])
    }
    return x.join('')
  }
  if (hex(md51('hello')) !== '5d41402abc4b2a76b9719d911017c592') {
    add32 = function (x, y) {
      var lsw = (x & 65535) + (y & 65535),
        msw = (x >> 16) + (y >> 16) + (lsw >> 16)
      return (msw << 16) | (lsw & 65535)
    }
  }
  if (typeof ArrayBuffer !== 'undefined' && !ArrayBuffer.prototype.slice) {
    ;(function () {
      function clamp(val, length) {
        val = val | 0 || 0
        if (val < 0) {
          return Math.max(val + length, 0)
        }
        return Math.min(val, length)
      }
      ArrayBuffer.prototype.slice = function (from, to) {
        var length = this.byteLength,
          begin = clamp(from, length),
          end = length,
          num,
          target,
          targetArray,
          sourceArray
        if (to !== undefined) {
          end = clamp(to, length)
        }
        if (begin > end) {
          return new ArrayBuffer(0)
        }
        num = end - begin
        target = new ArrayBuffer(num)
        targetArray = new Uint8Array(target)
        sourceArray = new Uint8Array(this, begin, num)
        targetArray.set(sourceArray)
        return target
      }
    })()
  }
  function toUtf8(str) {
    if (/[\u0080-\uFFFF]/.test(str)) {
      str = unescape(encodeURIComponent(str))
    }
    return str
  }
  function utf8Str2ArrayBuffer(str, returnUInt8Array) {
    var length = str.length,
      buff = new ArrayBuffer(length),
      arr = new Uint8Array(buff),
      i
    for (i = 0; i < length; i += 1) {
      arr[i] = str.charCodeAt(i)
    }
    return returnUInt8Array ? arr : buff
  }
  function arrayBuffer2Utf8Str(buff) {
    return String.fromCharCode.apply(null, new Uint8Array(buff))
  }
  function concatenateArrayBuffers(first, second, returnUInt8Array) {
    var result = new Uint8Array(first.byteLength + second.byteLength)
    result.set(new Uint8Array(first))
    result.set(new Uint8Array(second), first.byteLength)
    return returnUInt8Array ? result : result.buffer
  }
  function hexToBinaryString(hex) {
    var bytes = [],
      length = hex.length,
      x
    for (x = 0; x < length - 1; x += 2) {
      bytes.push(parseInt(hex.substr(x, 2), 16))
    }
    return String.fromCharCode.apply(String, bytes)
  }
  function SparkMD5() {
    this.reset()
  }
  SparkMD5.prototype.append = function (str) {
    this.appendBinary(toUtf8(str))
    return this
  }
  SparkMD5.prototype.appendBinary = function (contents) {
    this._buff += contents
    this._length += contents.length
    var length = this._buff.length,
      i
    for (i = 64; i <= length; i += 64) {
      md5cycle(this._hash, md5blk(this._buff.substring(i - 64, i)))
    }
    this._buff = this._buff.substring(i - 64)
    return this
  }
  SparkMD5.prototype.end = function (raw) {
    var buff = this._buff,
      length = buff.length,
      i,
      tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
      ret
    for (i = 0; i < length; i += 1) {
      tail[i >> 2] |= buff.charCodeAt(i) << (i % 4 << 3)
    }
    this._finish(tail, length)
    ret = hex(this._hash)
    if (raw) {
      ret = hexToBinaryString(ret)
    }
    this.reset()
    return ret
  }
  SparkMD5.prototype.reset = function () {
    this._buff = ''
    this._length = 0
    this._hash = [1732584193, -271733879, -1732584194, 271733878]
    return this
  }
  SparkMD5.prototype.getState = function () {
    return { buff: this._buff, length: this._length, hash: this._hash.slice() }
  }
  SparkMD5.prototype.setState = function (state) {
    this._buff = state.buff
    this._length = state.length
    this._hash = state.hash
    return this
  }
  SparkMD5.prototype.destroy = function () {
    delete this._hash
    delete this._buff
    delete this._length
  }
  SparkMD5.prototype._finish = function (tail, length) {
    var i = length,
      tmp,
      lo,
      hi
    tail[i >> 2] |= 128 << (i % 4 << 3)
    if (i > 55) {
      md5cycle(this._hash, tail)
      for (i = 0; i < 16; i += 1) {
        tail[i] = 0
      }
    }
    tmp = this._length * 8
    tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/)
    lo = parseInt(tmp[2], 16)
    hi = parseInt(tmp[1], 16) || 0
    tail[14] = lo
    tail[15] = hi
    md5cycle(this._hash, tail)
  }
  SparkMD5.hash = function (str, raw) {
    return SparkMD5.hashBinary(toUtf8(str), raw)
  }
  SparkMD5.hashBinary = function (content, raw) {
    var hash = md51(content),
      ret = hex(hash)
    return raw ? hexToBinaryString(ret) : ret
  }
  SparkMD5.ArrayBuffer = function () {
    this.reset()
  }
  SparkMD5.ArrayBuffer.prototype.append = function (arr) {
    var buff = concatenateArrayBuffers(this._buff.buffer, arr, true),
      length = buff.length,
      i
    this._length += arr.byteLength
    for (i = 64; i <= length; i += 64) {
      md5cycle(this._hash, md5blk_array(buff.subarray(i - 64, i)))
    }
    this._buff =
      i - 64 < length
        ? new Uint8Array(buff.buffer.slice(i - 64))
        : new Uint8Array(0)
    return this
  }
  SparkMD5.ArrayBuffer.prototype.end = function (raw) {
    var buff = this._buff,
      length = buff.length,
      tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
      i,
      ret
    for (i = 0; i < length; i += 1) {
      tail[i >> 2] |= buff[i] << (i % 4 << 3)
    }
    this._finish(tail, length)
    ret = hex(this._hash)
    if (raw) {
      ret = hexToBinaryString(ret)
    }
    this.reset()
    return ret
  }
  SparkMD5.ArrayBuffer.prototype.reset = function () {
    this._buff = new Uint8Array(0)
    this._length = 0
    this._hash = [1732584193, -271733879, -1732584194, 271733878]
    return this
  }
  SparkMD5.ArrayBuffer.prototype.getState = function () {
    var state = SparkMD5.prototype.getState.call(this)
    state.buff = arrayBuffer2Utf8Str(state.buff)
    return state
  }
  SparkMD5.ArrayBuffer.prototype.setState = function (state) {
    state.buff = utf8Str2ArrayBuffer(state.buff, true)
    return SparkMD5.prototype.setState.call(this, state)
  }
  SparkMD5.ArrayBuffer.prototype.destroy = SparkMD5.prototype.destroy
  SparkMD5.ArrayBuffer.prototype._finish = SparkMD5.prototype._finish
  SparkMD5.ArrayBuffer.hash = function (arr, raw) {
    var hash = md51_array(new Uint8Array(arr)),
      ret = hex(hash)
    return raw ? hexToBinaryString(ret) : ret
  }
  return SparkMD5
})

function createChunk(file, index, chunkSize) {
  return new Promise(resolve => {
    const start = index * chunkSize
    const end = start + chunkSize
    const spark = new SparkMD5.ArrayBuffer()
    const fileReader = new FileReader()
    fileReader.onload = e => {
      spark.append(e.target.result)
      resolve({
        start,
        end,
        index,
        hash: spark.end()
        // hash: e.target.result
      })
    }
    fileReader.readAsArrayBuffer(file.slice(start, end))
  })
}

onmessage = async e => {
  const { file, CHUNK_SIZE, startIndex, endIndex } = e.data
  const promise = []
  for (let i = startIndex; i < endIndex; i++) {
    promise.push(createChunk(file, i, CHUNK_SIZE))
  }
  const chunks = await Promise.all(promise)
  postMessage(chunks)
}
